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Eaton 9395XC UPS 1200kW/1200kVA, 1350kW/1350kVA or 1500kW/1500kVA 164001079—Rev 01
cabinet, no other cabinets or equipment are required for the single UPS to successfully support its applied
loads.
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Mooddeess
The 9395XC UPS supports a critical load in different modes of operation:
•
In Online mode, the critical load is supplied by the inverter, which derives its power from rectified utility AC
power. In this mode, the battery charger also provides charging current for the battery, if needed.
•
In Energy Saver mode, commercial AC power is supplied directly to the critical load through the continuous
static switch and transfers automatically to Online mode if an abnormal condition is detected. The Energy
Saver mode requires a UPS with a continuous static switch.
•
In Bypass mode, the critical load is directly supported by utility power.
•
In Battery mode, the battery provides DC power, which maintains inverter operation. The battery supports
the critical load.
The following paragraphs describe the differences in the five UPS operating modes, using block diagrams to
show the power flow during each mode of operation.
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shows the path of electrical power through the UPS system when the UPS is operating in Online
mode.
During normal UPS operation, power for the system is derived from a utility input source through the rectifier
input contactor K1. The front panel displays “Online,” indicating the incoming power is within voltage and
frequency acceptance windows. Three-phase AC input power is converted to DC using Power Semiconductor
or SiC MosFET devices to produce a regulated DC voltage to the inverter. When battery breaker is closed the
battery is charged directly from the regulated rectifier output through a buck or boost DC converter, depending
on the system voltage and the size of the battery string attached to the unit.
The battery converter derives its input from the regulated DC output of the rectifier and provides a bucked
regulated DC voltage charge current to the battery. The battery is always connected to the UPS and ready to
support the inverter should the utility input become unavailable.
The inverter produces a three-phase AC output to a customer's load without the use of a transformer. The
inverter derives regulated DC from the rectifier and uses Power Semiconductor or SiC MosFET devices and
pulse-width modulation (PWM) to produce a regulated and filtered AC output.
Summary of Contents for 9395XC
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